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Subject: Re: Bug report. Clang sqrtl(-1) causes access violation
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
References: <c80240c2-a30e-41b5-7635-cf31f54741d1 AT agner DOT org> <DB7PR01MB53860FB36CC45154C5862E99DE0C0 AT DB7PR01MB5386 DOT eurprd01 DOT prod DOT exchangelabs DOT com>
From: Agner Fog <agner AT agner DOT org>
Message-ID: <03f2a425-2f3f-4230-c4c5-3265f511d4f5@agner.org>
Date: Fri, 10 May 2019 21:44:51 +0200
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On 10/05/2019 15.50, Jose Isaias Cabrera wrote:

> It works for me.

Now it turns out that all the long double math functions cause access 
violations.

If you can't reproduce the error, what can I do to trace it?


Exception: STATUS_ACCESS_VIOLATION at rip=00180173164



Sam Habiel wrote:

> Wow I can't believe that The Agner Fog posted on the Cygwin mailing list!

This is the place to post bug reports, right?



On 10/05/2019 15.50, Jose Isaias Cabrera wrote:
> Agner Fog, on Friday, May 10, 2019 08:57 AM, wrote...
> >
> >Bug description:
> >
> >The sqrtl function under Clang causes an access violation when the
> >argument is negative.
> >
> >This error occurs only under Cygwin.
> >
> >This error occurs only with the sqrtl function, not with sqrt or sqrtf
> >
> It works for me.
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ clang sqrt.cpp
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ ls
> a.exe  a.exe.stackdump  ATT00001.txt  cygcheck.out  sqrt.cpp
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ ./a.exe
> -1.000000
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ uname -a
> CYGWIN_NT-6.1 HOR711318E 3.0.7(0.338/5/3) 2019-04-30 18:04 i686 Cygwin
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ clang --version
> clang version 5.0.1 (tags/RELEASE_501/final)
> Target: i686-pc-windows-cygnus
> Thread model: posix
> InstalledDir: /usr/bin
>
> e608313 AT HOR711318E /cygdrive/c/source/c++/cygwin
> $ cat sqrt.cpp
>
>
> #include <stdio.h>
> #include <math.h>
> float a = -1.f;
>
> int main() {
>     float b = sqrtl(a);
>     printf("%f\n", b);
>     return 0;
> }
>
>
>
>

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